Yepp Performance Problem!!!

[Rui Barbosa]

Hi i'm wondering what is wrong here...

I've created a demo sample project in visual studio 2012.

Added the entropy sample c++ code to it.

and hit run and for my surprise the naive implementation is much faster than the yeppp implmentation.

What can possible be going wrong?

My results are:

 

Processor: Intel Core i7-3667U
Logical cores: 4
L1I: 32768
L1D: 32768
L2: 262144
L3: 4194304

Naive implementation:
        Entropy = 4194002.298628
        Time = 0.225382
Yeppp! implementation:
        Entropy = 4194002.298631
        Time = 3.237421

[Rui Barbosa]

The same problema is happening with the polynomial sample...

Naive implementation:
        Time = 0.868909 secs
        Performance = 1.930838 GFLOPS
Yeppp! implementation:
        Time = 1.847622 secs
        Performance = 0.908044 GFLOPS
Max error:   0.000%

[Marat Dukhan]

I suppose that you use 32-bit (x86) version of the library.

The 32-bit version does not include optimized kernels.

To benefit from optimized kernels in Yeppp! please use 64-bit (x86-64) version of the library. Some kernels have also optimized version for ARM. Please look at documentation on individual function for the list of optimized implementations.

You may subscribe to this issue in Yeppp! bug tracker to know when 32-bit x86 kernels are implemented.

Regards,

Marat

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